The Dog Star is a nickname for Sirius, a star in the constellation Canis Major (Greater Dog).
Dog Star or Dogstar may also refer to:
"Dog Star" (short story) by Arthur C. Clarke Dogstar (TV series), a 2006 animated Australian series The Dog Star, a 1950 novel by Donald Windham The Dog Stars, a 2012 novel by Peter Heller The Dog Stars (film), adapting Heller's novel
Music Dogstar (band), a rock group including Keanu Reeves "Dogstar", a song by Hybrid from the 2006 album I Choose Noise "Dog Star", a song by Klaatu from the 1980 album Endangered Species